Safe construction



Mar. 6, 1923.

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UNITED STATES PATENT OFFICE.

EDWARD Gr. LEHMAN, OF CANTON, OI-IIO, ASSIGNOR. BY MESNE ASSIGNMENTS, TO UNITED ALLOY STEEL CORPORATION, OF CANTON, OHIO, A CORPORATION OF NEW YORK.

SAFE CONSTRUCTION.

Application filed January 24, 1921.

To all `whom. t may concern.:

Be it known that I, EDWARD G. LEHMAN, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Safe Construction, of which the following is a specification.

This invention relates to the construction of a fireproof safe or cabinet adapted to withstand high temperatures and to prevent a breaking or crushing of the walls by impact with other bodies.

Safes of this character must be so co'nstructed that high temperatures may be resisted for a considerable time without resulting in any material damage to the safe or its contents, and the structure must also possess sufiicient strength to prevent buckling or bending by the blows of other bodies in the wreckage of a burning building.

Safes of this type are of comparatively light weight as distinguished from the usual burglar proof safes, and usually comprise spaced inner and outer shells between which is located suitable heat insulating material. In such a light weight safe or cabinet it is difficult to secure sufficient strength in the shell to protect the heat insulating material from becoming crushed or broken without increasing the weight of the safe to such an extent as to make it too cumbersome for practical purposes.

It is well understood that the juncture of the side walls with the top, bottom, front and rear walls offers the least resistance to heat and in order to overcome this weak point as well as to provide an impact rcsistance sutlicient to prevent serious damage to the insulating material in case the safe falls or is struck by falling bodies, the present structure has been designed.

The objects of the invention are attained by providing a safe construction comprising an interior shell and an outer shell spaced therefrom, with transversely corrugated concaved walls located around the inner shell and the entire space between the concaved walls and the outer shell being filled with heat insulating material forming arches on all sides of the safe, thus making a structure which is not readily distorted by heavy blows, even though the outer shell be heated to a high temperature, and the increased thickness of the insulation at the angles and Serial No. 439,633.

corners, gives a greater heat resistance at the most exposed places.

In the drawings, forming part hereof;

Figure 1 is a transverse vertical section of a safe embodying the invention;

ig. 2, a section on the line 2f2, Fig. 1; an

Fig. 3, a section on the line 3 3, Figs. 1 and 2.

Similar numerals refer to similar parts throughout the drawings.

The outer shell of the cabinet comprises the outer side walls l-1, the rear wall 2, the top wall 3 and the bottom wall 4. The side walls may be connected to the rear walls by overlapping the adjacent edges of the side and rear walls and forming seams 5, the rear wall being connected to the top wall by a similar seam 6. The top wall may be formed of two halves, each integral with the adjacent side wall, the abutting edges thereof being bent back upon themselves as shown at 7 and connected by means of a channel strip 8. The rear wall may be connected to the bottom wall by means of a seam 9 and the side walls are preferably extended below the bottom wall and provided with the inwardly disposed channel portions 10 which receive the down turned flanges 11 of the bottom wall. The usual rollers 12 may be provided for easily moving the safe.

The inner shell comprises the side walls 13-13, the rear wall 14: and the top and bottom walls 15 and 16 respectively, said inner walls being preferably provided at their edges with angular anges 17 which are overlapped and connected together in any suitable manner, the inner shell being spaced from the outer shell upon all sides.

Transversely corrugated concaved sheets 18 are provided around the side, rear, top and bottom walls of the inner shell being preferably provided at their edges with the overlapping angular flat flanges 19 which may be connected in any convenient manner to the inner shell.

The entire space between the concaved walls 18 and the outer shell is filled with suitable heat insulating material 20, thus forming an arch upon each side of the safe, and thickest portions of the arches being located at the angles and corners of the safe where the greatest heat resista-nce is necessary, and the air spaces 21 between the concave sheets and the walls of the inner shell,

@retrasa not only supplements resistance of the heat insulating material, but delocalizes such heat as may penetrate the saine and distributes and dissipates its intensity throughout the corresponding wall of the inner shell.

Each door 22 is formed of a hollow steel shell 22a entirely filled with heat insulating material 23, said doors being hingedly con* nected in the usual manner to the body portion of the safe as indicated at 24.

l. A heat resisting safe or cabinet comprising spaced inner and outer metal shell walls, and heat insulating material located between said shells, the heat insulating material being arched from the inner shell walls.

2. A heat resisting safe or cabinet comprising spaced inner and outer shells7 and heat insulating material located between said shells, the thickness of the heat insulating material in the side of the case gradually decreasing from the angles and corners to the middle thereof.

3. A heat resisting safe or cabinet comprising inner and outer metal shell Walls, intervening metal sheets concaved from the angles of the inner shell walls, and heat insulating material filling the space between the outer shell and the concaved sheets.

4. A heat resisting safe or cabinet comprising spaced outer and inner metal shell walls, transversely corrugated metal sheets concaved from the angles of the inner shell of the walls, and heat insulating material filling the space between the outer shell and the concaved sheets.

EDWARD G. LEHMAN. 

